<template>
  <div>
<ul>
  <li v-for="(item,id) in arr" :key="id" >
    {{item}}
    <button  @click="del(id)">删除</button>
  </li>
</ul>
<button @click="add">生成</button>
  </div>
</template>

<script>
export default {
data(){
  return{
    arr:[1,5,3]
  }
},
methods:{
  del(index){
    this.arr.splice(index,1)
  },
  add(){
this.arr.push(Math.floor(Math.random()*20))
  }
}
}
</script>

<style>

</style>